Threat Model the Trust Boundary
Use threat modeling questions to identify trust boundaries and turn threats into design requirements.
Most missed security work hides at the line between trusted and untrusted. The four-question loop OWASP's threat-modeling guidance reduces the work to four questions: what are we building, what can go wrong, what will we do about it, and did we do enough. That loop matters because teams often jump from architecture to controls without first naming what the attacker can influence. Trust boundaries make threats concrete A trust boundary is any place where the system receives data, identity, commands, files, callbacks, or code from a different authority. The boundary can be external, like a public API call, or internal,…
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